Comment Basically, you can only spend so much (Score 2, Insightful) 188
Now take a Donald Trump. No matter how greedy he is there's only just so much he can buy. At some point his money is just sitting around, doing nothing. He'll invest some of it, lose some of it, etc. But He's only got so much time in the day to do that. Eventually it becomes a war chest laying around doing nothing.
When we take it even further, to the level the Waltons have achieved what we have is pretty much the dark ages. You've got a small group of folks with _all_ the wealth. They're more or less Gods (Divine Right of Kings, anyone?). They stop investing because, heh, why should they? They already have the best civilization has to offer. As a result things can really only get worse for them.
If the above sounds complicated it's because it is. That's what makes cutting the marginal tax rate so seductive. It sound like an easy answer to the world's problems. Supply side economics, right? But there really is a reason we called them Voodoo Economics...